Dynamo-electric machine



R. E. HELLMUND.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED DEc.I4. 191'6.

Patented Jari. 18, 1920.

xxx Il WITNESSES: ,0 QW 9 v (E HM.

UNITED STATES PATENT OFFICE.r

:RUDOLF` E. HELLMUND, OF S'WISSVALE, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC 8c MANUFACTURING COMPANY, A CORPORATION 0F PENNSYLVANIA.

DYNAMO-ELECTRIC MACHINE.

Specification of Letters Patent.

Application filed December A14, 1916. Serial No. 136,895.

bodymg concentric windings.

One object of my invention is to provide a concentric and a main winding for a dynamo-electric'machine which will be very 'Fig 1 of the drawing comprises a core 1 compact and may be rigidly braced in position and thoroughly insulated to protect theV same against the destructive influences of vibration. I

Another object of my invention is to provide an improved form of insulator for a winding of the above-indicated class.'

Heretofore, when it has been desired to provide an armature with a main and an auxiliary field winding, it has been necessary to either bring the leads from both sides of the core or to provide special room at one side of the core for the group connectors of the winding, since these connectors were necessarily positioned on the sameside of the core as the leads. Furthermore, by reason of the very crowded conditions prevailing, it has been diilicult to properly insulate and brace the windings. The coils of such inachines were subject to severe' vibration" which, in many instances, resulted in the breaking down of the insulation and connections.

My invention proposes an improved form of winding in' which the group connectors are located on the side of the coil opposite to the main leads. An improved form of insulator, comprising an insulating cap,'that is adapted to entirely inclose the end of the bar and to be readily applied to windings of this type, has been devised to facilitate the insulation of machines of this character.

An improved form of coil brace,by whichV is partially supported from adjacent coils, has also been provided to rigidly secure the end connectors in place and prevent the destructive effects of vibration.

Figure 1 of the accompanying drawing is each coil a side elevational view, partially diagrammatic in form, of a dynanidelectric machine constructed 1n accordance with my invention;` Fig. 2 is a schematic diagram of the improved forni of winding shown' in Fig. 1;

Fig. 3 is a side sectional view of an insulator'` constructed in accordance with my' invention; Fig. 4 is a sectional view on the line 4-4 of Fig. 3; Fig. 5 is a sectional view of a modified form of the insulator shown in Fig. 6 that'is adapted to be employed for insulating inductor bars of rectangular cross section; and Fig. 6 is an end view of the in# sulator shown in Fig. 5.

The dynamo-electric machine shown in winding that is adapted to be used as the` main winding, whereas the bars 5 are distributed over the remainder of the pole faces y `and constitute a compensating winding.

Fig. 2 of the drawing shows a schematic diagram of the windings 2 and 3 iii'whicli bars 4 are assembled into a plurality of coil groups 6, 7, 8 and 9 by a plurality of end connectors 10. The variousgroups of bars V4 are connected by group connectors 11.

The bars 5 are connected into groups 12 by a plurality of end connectors 13. Group connectorsy 14 are provided for connecting the coil groups 12. The winding 3 is of a usual form employed in dynanio-electric machines of this type and comprises leads 15 which supply energy to the coil groups 12 through group connectors 14. It will ybe noted that the leads 15 are on the same side of the core member as the group connectors 14, which is in accordance with customary practice.'

Leads 16 and 17 supply energy to the main winding 2 through group connectors 11 which are positioned on the side of the core opposite tothe leads 16 and 17. The location of the main in this favorable position is madepossible by employing a single active inductor 18, or

winding leads 16 and 17 an uneven number of inductors, from a coil group 8 as a lead to the adjacent coil group 9. The coil group 8 is thus provided with terminal leads 16 and 17 and is respectively connected to the adjacent coil groups 7 and 9 by group connectors 1l.

Referring particularly to Fig. 1 of the drawing, which is a View of the core l taken on the side opposite to that on which the winding leads 15, 16 and 17 are brought out, the connectors on the lead side of the core l are shown diagrammatically in order to vsimplify the drawing. Current for the Winding 2 is conducted from the lead 17, through inductors 4 and the corresponding end connectors 10 of the coil group S, and an improved group connector l1, to the coil group 7. The end connectors 10 are formed from strap copper and are bound together by tape '20. rlh'e group connectors 11 severally/comprise strapI 'conductors 21 and 22 and `a jumperconnection 23 which electrilcally''connects the conductors 2l and 22 but is insulated from the interposed end connectors 10. The conductor 22 extendslbetween the, jumpers 23 ci the coil groups 7 and 3 and an end portion 24 thereof which` extends 4beyond the group 8 to the adjacent group 9 and constitutes a brace to which the coil group 9 is secured by tape 20. The end connectors 13 are positioned close to the core 1 and may be compactly bound together. The bars 4 extend beyond the bars 5 in order that the end connectors l0 may be positioned outside oi the end connectors 13.

Insulators 25 are provided to effectively insulate the ends of the bars 5 from the bars 4 and the corresponding connectors. Each of the insulators 25 comprises a shield 26 having a laterally-extending sleeve 27 which is adaptedv to extend longitudinally along the bar 5 and is openA at one side to` admit the bar 5. A cap 28 is provided which may be placed, over the end of the bar 5 after the end connector 13 hasbeen secured: thereto, and hasL a portion 29 that is admitted Within the sleeve 27 of the disk member 26.

lA side opening 30 isv provided for the connectorsl3. The capmember 28'has anV end piece 31,'that effectively protects the end ofv the bar 5. Fig. 3 shows amodification of the.V insulator 25 that is particularlyadapted to insulate the endsof the bars4 which eX- tend. beyond the bars 5. The bars 4 are provided with slot insulation 32 over the rec@ tangular portion of the inductor 4. The strap connectors 10. are soldered to the cy-y lindrical end portions of the bars 4, and tape 33. is wound around the conductorsintermediatethe connectors 10 and the insulation32.` An insulatingcap 35, that is composedof a slotted insulating tube and an end piece 36, is adapted to be placed over the end of the'conductor and secured in tape 37. This provides an effective and easily` applied insulating cap for the ends of the bars 4.

The winding 2 may be employed with place by.

various forms of auxiliary, windings or by itselfv but the greatest advantage accrues therefrom when it is used in connection with a usual type of winding 3 in which the group connectors are positioned on the same side of the core as the main winding leads. By combining a winding of this latter type with a winding employing group connectors which are positioned on the opposite side of the armature core from the main 'winding leads, it is possible tof secure an even distribution of the end and group connectors for the two windings and, at theysameI time,uto bring. the main winding leads out' at one side of the armature 'corewithout employing auxiliary conductors. This l avoids the crowding togetheifof` all of the group connezctors on oneside ofthe'core and provides a winding whichmay .be easily. braced 4and insulated. It Ywill also 4,be notedl :that j the bar insulators aretparticularlyf eife'ctive for in# sulating. a winding ot this type.

Although I have describe'd embodiment of lmyinvention, it is n ot so limited and 1 'desi-re thatfonly such-limitationsshall be imposed are indicated in theappended claims. f" f I claim` as my invention:

l. In a dynamo-electric gmachine, the vcolnl bination with a core, of a winding for said core comprising a plurality of coil groups, a plurality of strap connectors for said groups disposed on one side of said core, each connector being mechanically connected to three coils for rigidly grouping the coils together, and leads forsaid winding disposed upon the opposite yside of said.` core. 2. lna dynamofelectric machine,the coins binationwith. a core, anda concentricwind'- ingi'or said` corey comprising a pluralityofv 00.1.1; groups, of. groupponnectors for ele@-r trically CQnnecting. said. coll groupsI and` mleausfor, extending eacltconuetorjto lnechanically. secure ,each coll group` to the, ad-

jacent coil groupsjin. order to rigidly sup.. port'saidwinding..

3. j In. a dynamo-'electric machine, the Coma,

bination Witha core, and a Winding for said,

core comprising a plurality of bars, offend connectors for grouping said. bars into coils,

andgroupconnectorsfor said coils, an elecf tricallyl inactiveendy ofyone of said group connectors extending toan adjacent coil and Secured coils. v

prising ajbar conductor,. of. any insulator forl the endoiA said bar comprising aninsulating.

disk. having a laterally-extending sleeve and a `cap .surroundingA the end. of, said; bar and portion. thereof disposedv within.v

theretolto rigidly connect all of said.`

4. The combination with a winding coml disk having a laterallyextending sleeve, said sleeve and disk having an open side for admitting said bar, and a cap surrounding the vend of said bar and having a portion thereof disposed within said sleeve.

6. The combination with a winding comprising a bar conductor, and an end connector for said conductor, of an insulator for the end of said bar comprising a disk slotted to receive said bar, 1.a laterally-extending sleeve secured to said disk and having a side opening to admit said bar, and a cap for incasing the end of said bar and provided with an opening through which said end connector extends.

7. The combination with a winding comprising a bar conductor, and an end connector for said conductor, of an insulator for the end of said bar comprising a disk slotted to receive said bar andfhaving side portions extending longitudinally along said bar, and a cap for incasing thelend of said bar and provided with a lateral opening through which said end connector extends and having a portion of said cap extending within the side portions of said disk.

8. In a dynamo-electric machine, a core member, two concentric windings for said core member, each of said windings comprising a plurality of coil groups, connectors for joining the coil groups of each winding, said connectors for the two windings 'being disposed on the respective sides of the core member, and leads for the two windings which are all located on one side of the core member.

9. In a dynamo-electric machine, a core member, a mainand a compensating concentric winding mounted on said core member, each of said windings comprising a plurality of coil groups, two groups of connectors for `joinir'lg'the coil groups of the respective windings, said groups of connectors being locatedfon the respective sides of the core member, and leads for the two windings that arev located on the side of the. core member that is. opposite to the connectors for the main field winding.

In testimony. whereof I have hereunto subscribed my name this 7th day of Dec.

RGD OLF E. HELLMUND. 

